import { asyncRouterMap, constantRouterMap } from '@/router'
/* Layout */
import Layout from '@/views/layout/Layout'
/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
  if (route.meta && route.meta.roles) {
    return roles.some(role => route.meta.roles.includes(role))
  } else {
    return true
  }
}

/**
 * 递归过滤异步路由表，返回符合用户角色权限的路由表
 * @param routes asyncRouterMap
 * @param roles
 */
function filterAsyncRouter(routes, roles) {
  const res = []
  routes.forEach(route => {
    const tmp = { ...route }
    if (hasPermission(roles, tmp)) {
      if (tmp.children) {
        tmp.children = filterAsyncRouter(tmp.children, roles)
      }
      res.push(tmp)
    }
  })

  return res
}
/**
 * 递归组装异步路由表
 * @param {*} item
 */
function formatAsyncRouterMap(item) {
  console.log(item)
  item.forEach(function(value, index) {
    if (value.children_component) {
      value.component = (resolve) => require(['@/views/' + value.children_component], resolve)
    }
    if (value.children) {
      formatAsyncRouterMap(value.children)
    }
  })
}

const permission = {
  state: {
    routers: constantRouterMap,
    addRouters: []
  },
  mutations: {
    SET_ROUTERS: (state, routers) => {
      state.addRouters = routers
      state.routers = constantRouterMap.concat(routers)
    }
  },
  actions: {
    GenerateRoutes({ commit }, data) {
      return new Promise(resolve => {
        const { roles, routerMap } = data
        let accessedRouters
        console.log(routerMap)
        if (routerMap !== undefined) {
          routerMap.forEach((item, index) => {
            if (item.component && item.component === 'Layout') {
              item.component = Layout
            }
            if (item.children) {
              formatAsyncRouterMap(item.children)
            }
            asyncRouterMap.push(item)
          })
        }
        if (roles.includes('admin')) {
          accessedRouters = asyncRouterMap
        } else {
          accessedRouters = filterAsyncRouter(asyncRouterMap, roles)
        }
        commit('SET_ROUTERS', accessedRouters)
        resolve()
      })
    }
  }
}

export default permission
